adler32_8cpp-source.html
来自「Crypto++是一个非常强大的密码学库,主要是功能全」· HTML 代码 · 共 91 行
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>Crypto++: adler32.cpp Source File</title><link href="doxygen.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.3.2 --><div class="qindex"><a class="qindex" href="index.html">Main Page</a> | <a class="qindex" href="namespaces.html">Namespace List</a> | <a class="qindex" href="hierarchy.html">Class Hierarchy</a> | <a class="qindex" href="classes.html">Alphabetical List</a> | <a class="qindex" href="annotated.html">Compound List</a> | <a class="qindex" href="files.html">File List</a> | <a class="qindex" href="namespacemembers.html">Namespace Members</a> | <a class="qindex" href="functions.html">Compound Members</a> | <a class="qindex" href="globals.html">File Members</a></div><h1>adler32.cpp</h1><div class="fragment"><pre>00001 <span class="comment">// adler32.cpp - written and placed in the public domain by Wei Dai</span>00002 00003 <span class="preprocessor">#include "pch.h"</span>00004 <span class="preprocessor">#include "adler32.h"</span>00005 00006 NAMESPACE_BEGIN(CryptoPP)00007 <a name="l00008"></a><a class="code" href="class_adler32.html#_adler32a1">00008</a> <span class="keywordtype">void</span> <a class="code" href="class_adler32.html#_adler32a1">Adler32::Update</a>(<span class="keyword">const</span> byte *input, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> length)00009 {00010 <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> BASE = 65521;00011 00012 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> s1 = m_s1;00013 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> s2 = m_s2;00014 00015 <span class="keywordflow">if</span> (length % 8 != 0)00016 {00017 <span class="keywordflow">do</span>00018 {00019 s1 += *input++;00020 s2 += s1;00021 length--;00022 } <span class="keywordflow">while</span> (length % 8 != 0);00023 00024 <span class="keywordflow">if</span> (s1 >= BASE)00025 s1 -= BASE;00026 s2 %= BASE;00027 }00028 00029 <span class="keywordflow">while</span> (length > 0)00030 {00031 s1 += input[0]; s2 += s1;00032 s1 += input[1]; s2 += s1;00033 s1 += input[2]; s2 += s1;00034 s1 += input[3]; s2 += s1;00035 s1 += input[4]; s2 += s1;00036 s1 += input[5]; s2 += s1;00037 s1 += input[6]; s2 += s1;00038 s1 += input[7]; s2 += s1;00039 00040 length -= 8;00041 input += 8;00042 00043 <span class="keywordflow">if</span> (s1 >= BASE)00044 s1 -= BASE;00045 <span class="keywordflow">if</span> (length % 0x8000 == 0)00046 s2 %= BASE;00047 }00048 00049 assert(s1 < BASE);00050 assert(s2 < BASE);00051 00052 m_s1 = (word16)s1;00053 m_s2 = (word16)s2;00054 }00055 <a name="l00056"></a><a class="code" href="class_adler32.html#_adler32a2">00056</a> <span class="keywordtype">void</span> <a class="code" href="class_adler32.html#_adler32a2">Adler32::TruncatedFinal</a>(byte *hash, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> size)00057 {00058 ThrowIfInvalidTruncatedSize(size);00059 00060 <span class="keywordflow">switch</span> (size)00061 {00062 <span class="keywordflow">default</span>:00063 hash[3] = byte(m_s1);00064 <span class="keywordflow">case</span> 3:00065 hash[2] = byte(m_s1 >> 8);00066 <span class="keywordflow">case</span> 2:00067 hash[1] = byte(m_s2);00068 <span class="keywordflow">case</span> 1:00069 hash[0] = byte(m_s2 >> 8);00070 <span class="keywordflow">case</span> 0:00071 ;00072 }00073 00074 Reset();00075 }00076 00077 NAMESPACE_END</pre></div><hr size="1"><address style="align: right;"><small>Generated on Tue Jul 8 23:34:07 2003 for Crypto++ by<a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border=0 > </a>1.3.2 </small></address></body></html>⌨️ 快捷键说明
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